Install for macOS Mojave Dark Mode
One of the major new macOS Mojave features is Dark Mode. This turns the whole macOS black and gray instead of white and silver. It is a major system shock at first, but it grows on you.
This is perfect if you use your Mac at night or in dark situations a lot. This is something you will see a prompt to turn on as soon as you start using macOS Mojave, but you can also switch back and forth between Dark Mode and the normal mode.
Stock Apple apps on macOS Mojave support Dark Mode already, so the new Mac App Store, Mail, Messages, Maps, Calendar, Photos and many others also work with this so you aren't jarred into the light when you open an app.
Developers will be able to add in support for Dark Mode, but during the beta, expect to see most of the focus on Apple's stock apps.